dcrat | 4b734afbb65c47d96c53ddc24250cacf96e62bbc56e0c64eca978d3255bbc745

Analysis

max time kernel
143s
max time network
152s
platform
windows10_x64
resource
win10v20210408
submitted
09/07/2021, 03:42

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General

Target
aa92aa0efc2c36f0e4f57e014e8c3f84.exe
Size 1.8MB
Sample210709-dfkcc5law6
SHA256 4b734afbb65c47d96c53ddc24250cacf96e62bbc56e0c64eca978d3255bbc745
MD5 aa92aa0efc2c36f0e4f57e014e8c3f84
SHA1 96f15634914d42e38dd1c6d3af808abf6f5bc05b
SHA512 a9c11546e7c0d498be58ad5f30b5bdeb5d2145e1e423f56c66e96d57051cc18291dc0c32911027c06102ada9af2580f457287d664a1f8d4cd4d315bea53e476f
MD5 SHA1 SHA512

Score

10^/10

dcrat infostealer rat spyware stealer

Malware Config

Signatures

DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
rat infostealer dcrat

DCRat Payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000200000001ab51-121.dat	dcrat
behavioral2/files/0x000200000001ab51-122.dat	dcrat
behavioral2/files/0x000100000001ab63-141.dat	dcrat
behavioral2/files/0x000100000001ab63-142.dat	dcrat

Executes dropped EXE 2 IoCs

pid	Process
784	Hostmonitor.exe
2364	csrss.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
15	ipinfo.io
16	ipinfo.io

Drops file in System32 directory 9 IoCs

description	ioc	Process
File created	C:\Windows\System32\SettingsHandlers_Devices\spoolsv.exe	Hostmonitor.exe
File opened for modification	C:\Windows\System32\SettingsHandlers_Devices\spoolsv.exe	Hostmonitor.exe
File created	C:\Windows\System32\lusrmgr\cc11b995f2a76da408ea6a601e682e64743153ad	Hostmonitor.exe
File created	C:\Windows\System32\SettingsHandlers_Devices\f3b6ecef712a24f33798f5d2fb3790c3d9b894c4	Hostmonitor.exe
File created	C:\Windows\System32\lusrmgr\winlogon.exe	Hostmonitor.exe
File created	C:\Windows\System32\dggpext\slui.exe	Hostmonitor.exe
File created	C:\Windows\System32\dggpext\a29f4157103644af5692ebfddf35f6dff4e237da	Hostmonitor.exe
File created	C:\Windows\System32\FontProvider\lsass.exe	Hostmonitor.exe
File created	C:\Windows\System32\FontProvider\6203df4a6bafc7c328ee7f6f8ca0a8a838a8a1b9	Hostmonitor.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-crt-convert-l1-1-0\OfficeClickToRun.exe	Hostmonitor.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-crt-convert-l1-1-0\e6c9b481da804f07baff8eff543b0a1441069b5d	Hostmonitor.exe
File created	C:\Program Files (x86)\Windows Sidebar\Gadgets\winlogon.exe	Hostmonitor.exe
File created	C:\Program Files (x86)\Windows Sidebar\Gadgets\cc11b995f2a76da408ea6a601e682e64743153ad	Hostmonitor.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 10 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
3988	schtasks.exe
3160	schtasks.exe
664	schtasks.exe
2180	schtasks.exe
4028	schtasks.exe
3904	schtasks.exe
840	schtasks.exe
3168	schtasks.exe
1820	schtasks.exe
3944	schtasks.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\Local Settings	aa92aa0efc2c36f0e4f57e014e8c3f84.exe
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\Local Settings	Hostmonitor.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2372	PING.EXE

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
784	Hostmonitor.exe
784	Hostmonitor.exe
784	Hostmonitor.exe
784	Hostmonitor.exe
784	Hostmonitor.exe
2364	csrss.exe
2364	csrss.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2364	csrss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	784	Hostmonitor.exe
Token: SeDebugPrivilege	2364	csrss.exe

Suspicious use of WriteProcessMemory 36 IoCs

description	pid	Process	procid_target
PID 664 wrote to memory of 3596	664	aa92aa0efc2c36f0e4f57e014e8c3f84.exe	75
PID 664 wrote to memory of 3596	664	aa92aa0efc2c36f0e4f57e014e8c3f84.exe	75
PID 664 wrote to memory of 3596	664	aa92aa0efc2c36f0e4f57e014e8c3f84.exe	75
PID 3596 wrote to memory of 928	3596	WScript.exe	78
PID 3596 wrote to memory of 928	3596	WScript.exe	78
PID 3596 wrote to memory of 928	3596	WScript.exe	78
PID 928 wrote to memory of 784	928	cmd.exe	80
PID 928 wrote to memory of 784	928	cmd.exe	80
PID 784 wrote to memory of 840	784	Hostmonitor.exe	82
PID 784 wrote to memory of 840	784	Hostmonitor.exe	82
PID 784 wrote to memory of 3944	784	Hostmonitor.exe	84
PID 784 wrote to memory of 3944	784	Hostmonitor.exe	84
PID 784 wrote to memory of 3988	784	Hostmonitor.exe	86
PID 784 wrote to memory of 3988	784	Hostmonitor.exe	86
PID 784 wrote to memory of 3160	784	Hostmonitor.exe	88
PID 784 wrote to memory of 3160	784	Hostmonitor.exe	88
PID 784 wrote to memory of 3168	784	Hostmonitor.exe	90
PID 784 wrote to memory of 3168	784	Hostmonitor.exe	90
PID 784 wrote to memory of 664	784	Hostmonitor.exe	92
PID 784 wrote to memory of 664	784	Hostmonitor.exe	92
PID 784 wrote to memory of 2180	784	Hostmonitor.exe	94
PID 784 wrote to memory of 2180	784	Hostmonitor.exe	94
PID 784 wrote to memory of 4028	784	Hostmonitor.exe	96
PID 784 wrote to memory of 4028	784	Hostmonitor.exe	96
PID 784 wrote to memory of 3904	784	Hostmonitor.exe	98
PID 784 wrote to memory of 3904	784	Hostmonitor.exe	98
PID 784 wrote to memory of 1820	784	Hostmonitor.exe	100
PID 784 wrote to memory of 1820	784	Hostmonitor.exe	100
PID 784 wrote to memory of 836	784	Hostmonitor.exe	102
PID 784 wrote to memory of 836	784	Hostmonitor.exe	102
PID 836 wrote to memory of 3380	836	cmd.exe	104
PID 836 wrote to memory of 3380	836	cmd.exe	104
PID 836 wrote to memory of 2372	836	cmd.exe	105
PID 836 wrote to memory of 2372	836	cmd.exe	105
PID 836 wrote to memory of 2364	836	cmd.exe	106
PID 836 wrote to memory of 2364	836	cmd.exe	106

C:\Users\Admin\AppData\Local\Temp\aa92aa0efc2c36f0e4f57e014e8c3f84.exe
"C:\Users\Admin\AppData\Local\Temp\aa92aa0efc2c36f0e4f57e014e8c3f84.exe"
1⤵
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:664
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Adobe\CsG111bpnHmlwZ.vbe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3596
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Adobe\n28F9Wy0qQGxIm2i5KrOwGAqIk8BCQ.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:928
  - - C:\Adobe\Hostmonitor.exe
      "C:\Adobe\Hostmonitor.exe"
      4⤵
      Executes dropped EXE
      Drops file in System32 directory
      Drops file in Program Files directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:784
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\SettingsHandlers_Devices\spoolsv.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:840
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "dllhost" /sc ONLOGON /tr "'C:\Users\Default User\dllhost.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:3944
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-crt-convert-l1-1-0\OfficeClickToRun.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:3988
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "dllhost" /sc ONLOGON /tr "'C:\Adobe\dllhost.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:3160
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "csrss" /sc ONLOGON /tr "'C:\Documents and Settings\csrss.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:3168
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\lusrmgr\winlogon.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:664
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Sidebar\Gadgets\winlogon.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:2180
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "slui" /sc ONLOGON /tr "'C:\Windows\System32\dggpext\slui.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:4028
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\FontProvider\lsass.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:3904
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Users\Default\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\OfficeClickToRun.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:1820
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\9zOpczHbWB.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:836
      - C:\Windows\system32\chcp.com
        
        chcp 65001
        6⤵
        
        PID:3380
      - C:\Windows\system32\PING.EXE
        
        ping -n 5 localhost
        6⤵
        Runs ping.exe
        
        PID:2372
      - C:\Documents and Settings\csrss.exe
        
        "C:\Documents and Settings\csrss.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        
        PID:2364

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/784-123-0x00000000002F0000-0x00000000002F1000-memory.dmp

Download

memory/784-125-0x000000001B000000-0x000000001B002000-memory.dmp

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memory/2364-147-0x0000000000D20000-0x0000000000D24000-memory.dmp

Download

memory/2364-148-0x0000000000D60000-0x0000000000D67000-memory.dmp

Download

memory/2364-149-0x0000000000D70000-0x0000000000D78000-memory.dmp

Download

memory/2364-146-0x0000000000D10000-0x0000000000D15000-memory.dmp

Download

memory/2364-145-0x000000001BB02000-0x000000001BB03000-memory.dmp

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